Furnace wall



-Patented Jan. 29, 1946 UNITED STATES PATENT OFFICE FURNACE v'vA'LLGustav A; Ream, Worcester, Mas-.-,assignor to Riley Stoker Coi-poration,Worcester, Mass, a

corporation of Massachusetts Appiieatian October 9, 1943, serial No.565,6l4

3 Claims:

This invention relates to iurnace walls, and more particularly to wallsof the Water cooled type adapted for use with steam boiler furnaces.

One highly satisfactory prior construction for this purpose comprises arow of upright Water tubes exposed on one side tothe heat of the furnaceand covered on the other side by a layer of refractory material, a layerof heat insulating material, and an outer casing of steel plates.However, this construction is expensive, since a considerable ,weight ofsteel is required, and much labor is involved in the manufacture anderection of the casing. Great care must be taken to ensure tight jointsbetween the plates so that air leakage through the wall will beprevented;

It, is accordingly one object of the invention to provide acomparatively inexpensive furnace wall construction which will requireno steel plate" casing and yet will be thoroughly efiective inpreventing air leakage into the furnace.

It is a further object of the invention to pro: vide a furnace wallconstruction which can be erected in a simple and expeditious manner.

It is a further object of the invention to pro vide' a furnace wallconstruction which will remain free from buckling and distortionresulting from changes in temperature.

With these and other objects in view, as will be apparent to thoseskilled in the art, the invention resides inthe combination of partssetforth in the specification and covered by the claimsap'pendedhereto.I 7

Referring to: the drawings illustrating one embodiment of the invention,and in whichlike reference numerals indicate like parts:

Fig. 1 is a vertical section through a furnace wall,- thesection beingtaken-on'the line of l=l of Fig. 2;

Fig. 2 is a section taken on the line 22 of Fig. Bis a fragmentaryelevation ofthecutside of the wall;

Fig. 4- is an enlarged fragmentary view showingthe detailedconstructionv of certain parts;

Fig. 5 is a vertical section through a modified wall construction, thesection being taken on the line 5 5 of Fig. 6';

- Fig 6 is a section on the line 6'-'-6 of Fig. 5;. and

Fig. '7 is a fragmentary elevation of the out side of the w'a'll.

The embodimentillustrated in Figs. 1- to 4 mclusive comprises a row ofclosely spaced vertic'al' water tubes to which are connected at theirlower ends to a horizontal header H and at their upper ends to ahorizontal header [2. Steam releas'er tubes l4 extend upwardly from theupper header [2. The end portions of the water tubes ID are bent andstaggered at their connections with the headers, and. the spaces betweenthese bent portions are filled sa isfactory a is w res b o e e arteries-These tubes I ll form the inner lining of a f;uifw an a t ey i rc editen w heat of the furnace. In accordancje with the usual practice, wateris supplied continuously tq the lower header I by suitable means notshowni so that an upward circulation may be maintained through thetubes. N H u On the outer side'of tjhe row of water wall b s .10 es s rid a layer pr h a i sulating material ll which is preierablylsupported-independently of the water tubes In the particular embodimentillustrated this material rests upon a horizontal shelf l8 whichprojects inwardly from a horizontalbeam l9 loeated near the; lowerheader I l, An upper horizontal beam 2 r dm h u er der .1? a m-the e twobeams I9 and 2! are connected by a series of spaced verticallyelongatedupright buckstay members 22 of 1- cross section arranged withtheir central webs perpendicular to the plane' ot the wall and theirinner flanges engaging the insulation ll; These buckstays 22 form aframework within which there is built a brick wall 24; this wallengaging the insulation ll to provide lateral support therefor. Thebrick wall 24 i s formed entirely of stretchers, laid in mortar with thejointsstaggered: in the normal manner, the thickness ofthe wall beingequal to the widtlr of the" bricks. The lowermost; course of bricks islaid in channel members 25 which are supported on the lower beam 19 withtheir flanges extend-' in-g upwardly; The bricks extend between the"flanges of ,the buckstay members 22,- as best shown in Fig. 2, so thatthese members provide lateral support forthe' brickwork, Vertical ropes26- (Fig. 4) of asbestos or the like may be in-i stalled between thebrickwork and the central webs of the buckstays to provide a' sealagainst air leakage and at the same time allow for ex pension of thelzzrickworlr;

Each" vertical section of the brick wall 24 is preferably divided intopanels by means of hori' zontalbeams 28 of I cross section located theplane of the wall, with the central webs of the beams horizontal andtheir flanges strad= dling the brickst provide improvedlateral sup porttherefor. These beams 28' are free to float vertically their weightbeing carried solely by the brickwork; The 'endsof the beams are cobed;as best shown- Fig". 4, to'fit between the flanges of the buckstays 22for free vertical sliding movemerit relative thereto.

In constructing thiswall, the tubes and struc: tural steel" work willfirst be erected, whereupon: the insulation and: brickwork will beinstalled, starting at the bottom and: working upwardly.- As each panelof brickworkiscompleted; mortar will-be" applied-on the top otth'e'uppercourse ofbricks. and one of the beams 28 willbe placed on the mortar.Mortar will then be applied to the top ofythis beam, and the nextzcourseof" bricks will be laid on this mortari The brick! work may beconstructed of any desired type of bricks, and need not be expensive.For example,

' ordinary red brick or ,a cheap grade of fire brick may be used, sincethe insulation will protect the bricks from high temperatures; Thebrickwork serves to'provi'de lateral support forthe insula:

tion and to form a comparatively tight seal vertically, their weightbeing carried .solely by I the brickwork. The ends of the beams arecoped -to fit between the flanges of the buckstays 52 for free verticalsliding movement relative thereto.

' 'It will be noted that the wall of Figs. 5 to 7 is similar to that ofFigs. 1 to 3 in all essential against the leakage of air into thefurnace. The 7 construction is such as to allow the brickwork to expandfreely independently of the buckstays 22,

7 so that the dangerof cracking will be avoided.

" In Figs. 5 to 7 inclusive there is shown a somewhatmodified'construction comprising a row'of vertical water tubes 40which'are spaced apart more widely than the tubes H) 'of Figs. 1 and 2.7

These tubes 40 are connected at their lower ends to a horizontal header4| and at their upper ends to a horizontal header 42. Steam releasertubes 44 extend upwardly from the upper header 42.

- tiles 46 between the tubes and the insulation.

Because of the wider spacing of these water wall tubes 40, there is none'cessity for staggering their end portions, and they'are accordinglyconnected to the headers in single lines; These tubes 4% form the innerlining ofa furnacewall, and they are. exposed to the radiant heat of thefurnace. In accordance with the usual practice, water is suppliedcontinuously to the lower header 4| by suitable means .(not shown) sothat an upward circulation may be maintained through the tubes. r

.The wide spacing of the wat'er wall tubes 40' renders it inadvisable toapply insulating material-directly to the outer side thereof, since suchmaterial is not well adapted towithstand exposur to high radiant heatand to slag deposits I R fromburning fuel. Accordingly'a layer ofrefractory -material 46 is provided directly outside of the tubes, thislayer preferably being constructed 'of shiplap firebricktiles. Thesetiles rest-upon a horizontal shelf 4'I'which projects inwardly from ahorizontal beam 48 located near the lowerchamber 4l.-- Outside of thetiles 41 there is. provided a layer of heat insulating materia'l50 whichis likewise supported by. the shelf 41. An upper horizontal beam 5| is'located near. the upper header 42, and this beam is connected to thelower beam 48 by a series of spaced verticallyelongated upright buckstaymembers 52 of --I cross section arranged with their central websperpendicular to the plane of the'wall and their inner flanges engagingthe insulation 50. These buckstays 52' form a framework within whichthere is built a brick wall 54, this wall engagingthe insulation toprovide lateral support therefor. The brick wall '54 is formed entirelyof stretchers, laid in mortar with the joints staggered in the usualmanner, the thickness of the wall being equal to the width of thebricks. The lowermost course of bricks is laid on the lower beam. 4Bandheld in place laterally by angle bars 55 fastened to the'beam'.= Thebricks extend-between the flanges of the buckstay. members:5'2, as best.shown, in Fig. 6, so that these members provide lateral support forthe'brickwork. Vertical ropes 56 of asbestos or the like Both walls arecomparatively inexpensive to construct, and adapted for long periods ofsatisfactory service under difiicult operating conditions. No steelcasing is required. 1 a

While the buckstay members 2252 and the floating beams 2858fhave beendescribed as'of I'cross section, this wording when used in the claims isnot to be given an unduly limited interpretation but is intended toincludesuch equivalents as H beams having wider flanges than ordinary Ibeams, as well as members built up of channels, angles or the like toprovidea substantially I or H cross section.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is: f V I 1. A furnace wall comprising an'innerrow of water wall tubes, a layer of heat insulating'material outside ofthe water tubes, a series of spaced vertically "elongated uprightbuckstay members outside of the insulating material, brick-- worklocated between th'e'buckstay members and providing lateral support forthe insulating material, and horizontal beams dividing the brickworkinto panels, the buckstay members'engaging the ends of" the beams'tosupport the same against movement outwardly of the wall, and the beamsbeing slidable vertically" relative tothe buckstay members.

members outside of the insulating material, brickwork located betweenthe buckstay members and providing lateral support for the insulatingmaterial, and horizontal beams of I cross section dividing the brickworkinto panels,the beams being provided with horizontally positioned centerwebs andvertically extending flanges straddling the brickwork, and theends of the beam beingin vertical sliding'engagement with the buckstays.

3. A furnace wall comprising an inner row of water wall tubes, a layerof heat insulating material outside of the water tubes, a s er'ies ofspaced uprightbuckstay members of I cross section outside of theinsulating materiaL-the buckstay members having centralwebs/perpendicular to the plane of the wall and laterally projectingflanges, brickwork located between the buckstay members to providelateral support for the insulating material, the brickwork extending"between the flanges .of the buckstay members, and horizontal beamsofsI'cross section dividing the brickwork into panels, the beams beingprovided with horizontally positioned central webs and verticallyextending flanges straddling the brickwork; and the ends of the beamsbeing coped .to fit between the flanges of the buckstay members forvertical sliding movement relative thereto;

